Steam-engine.



PATENTED JUNE 2, 1908.

HQE. LUNDGRBN. STEAM ENGINE.

" APYLIOATION FILED JULY 1. 1907.

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rnpuomus PETERS co., ,umsunyamn. n. c.

11.. B. LUNDGREN.

STBAM ENGINE. urmoumn FILED JULY 1. 1907.

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'PATENTED JUNE 2, 190a,

" H. E.- LUNDGREN.

STEAM ENGINE. APPLICATION FILED JULY 1, 1901.

EWIIHM PATENTED JUNE 2, 1908.

f PATENTED JUNE 2, 1908.

H.E.LUNDGREN.

STEAM ENGINE.

APPLIUATION FILED JULY 1. 1907.

H. E-LUNDGREN.

STE-AM ENGINE Arrmon'mn FILED JULY 1. 1007.

No. 889,703. PATENTED JUNE 2, 1908,.

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' generally of the rotary type, and broadly 7. eludes an engine in whichtwo opposed pistons are employed, the rod of one piston consideelevation thereof. Fig. '3 is a detailed HILMOR E. LUNDGREN, OF

FORT OROOK, NEBRASKA.

STE AM-ENGINE Specification of Letters Patent.

Patented June 2, 1908.

Application filed July 1, 1907. Serial No. 381,780.

To all whom it may concern: I

Be it known that I, HILMOR E. LUNDGREN, a citizen of the United States,residing at Fort Crook, in the county of Sarpy and State of Nebraska,have invented certain new and useful Improvements in Steam-Engines, ofwhich the following is a specification.

This invention relates to new and useful improvements in steam engines,and it has more particular reference to the controlling valve therefor,and to the operative connections between such controlling valve and thecross heads of the engine.

In its broadest aspect the invention incentrically surrounding the rodof the other piston. These piston rods are connected with reciprocatingcross heads, one of the piston'rods having a direct connection with thecrank shaft of the engine in a manner to be described, and the otherpiston rod having connection with the reversing lever, which is in turnconnected with the crank shaft. The said reversing lever is mounted on arock shaft which carries an upwardly projecting arm and the latter,directly operated from the crank shaft of the engine, serves to operatethe reversing valve within the steam chest. The reversing valve isspeaking, is constructed to admit steam between the opposed pistons andto permit of the exhaust of steam from the other sides of said pistonsbetween the same and the ends of the cylinder on one stroke of theengine, and on the other stroke of the engine to admit steamsimultaneously to the ends of the cylinder, whereby the pistons aremoved together and to permit of the exhaust of the previous charge ofsteam into the space between the pistons.

In connection ,with a reversing valve and its mechanism constructedgenerally ,as above described, the invention has for its object toprovide a novel construction, combination and arrangement of parts, thede tails of which will appear in the course of the following descriptionin which reference is had to the accompanying drawings forming a part ofthis specification, like characters of reference designating similarparts throughout the several views, wherein:

Figure 1 is a top plan view of the engine and its adjuncts as anentirety. Fig. 2 is a perspective view showing the controlling valvecasing assembled upon the steam chest together with the arm carried bythe valve stem, the said arm having connection with the operatingelements of the valve mechanism. Fig. 4 is a section takenlongitudinally of the engine cylinder and through the reversing valve.Fig. 5 is a horizontal section on the line ccac of Fig. 4. Fig. 6 is abottom plan view of the reversing valve per 86. Fig. 7 is a centralvertical section taken on the line y y of Fig. 4, and Fig. 8 is a viewin elevation of the valve.

In the accompanying drawings there is shown an engine bed 1 ofconventional form, which at one end supports the engine cylinder 2, andat its other end is provided with an enlarged bearing 3 for the crank orpower shaft 4, the latter carrying at its outer end a belt wheel 5,serving also as a balance wheel,

and at its inner end a crank disk 6. The cylinder 2 is closed at itsends by heads 7 and 8 of usual construction. The pistons 9 and 10 areprovided in said cylinder adjacent the respective heads 7 and 8, thepiston 9 being carried upon an elongated piston rod 11, and the piston10 being carried upon a shorter hollow piston rod 12,'which surroundsthe rod 11. The piston rod 11 at its outer end has connection with across head 13, and the rod 12 has connection with a cross head 14,

' the cross heads 13 and 14 working in guides 15 of ordinary form.

Between the guides 15 is a transverse rock shaft 16, mounted in suitablebearings 17 secured to the sides of the bed 1. The shaft 16 is providedwith spaced parallel coincident two armed levers 18, having their endscurved in opposite directions on each side of said shaft. The cross head14 is constructed with u wardly extending ears 19 and is connected ymeans of a pivoted link 20 with the upper ends of the levers 18, itbeing understood that the link 20 is constructed to have its endportions pivotally received between the ears 19 and the ends of thelevers 18.

The cross head 13 has pivotal connection with a link 21, and the latteris in turn pivotally connected by a yoke 22 with the wrist in 23 of thecrank disk 6. The yoke 22 is likewise constructed for pivotal connectionwith a link 24 which latter has its other end pivotally received betweenthe lower ends of the levers 18.

The above description relates generally to the connections between thepistons and the power shaft 4, and thevalve mechanism together with thedetailed construction of the valve will now be taken up.

The shaft 16 carries at one side thereof an upwardly projectin arm 25,constructed with a longitudinal s 0t 26. The arm 25, to the end ofeffecting the operation of the valve is rocked by connections from theshaft 4, and with this object in view, the said arm has a pin 27adjustably engaged in its slot 26, the in 27 carrying a pivoted babbittblock 28 W ich conformably fits in an extension 29 of a link 30, thelatter having a handle 31 at one end thereof and at its other end havingconnection with an eccentric strap 32 of conventional form, and whichsurrounds an eccentric disk 33 provided upon the shaft 4.

The cylinder 2 is constructed with ports 35 and 36, adjacent the heads 7and 8, and with a centrally located port 37. The ports 35 and 36communicate with respective passages 38 and 39 cut into the bottom faceof a plate 40, imposed on said cylinder, and the port 37 communicateswith a centrally located passage 41, cut into said plate. The plate 40forms the base of the steam chest, the latter being constituted of abody portion 42, and a head 43 which are detachably engaged with oneanother and With said plate by bolt and nut fastenings 44, as shown moreparticularly in Fig. 3. The passages 38, 39 and 41, in the plate 40,extend to one side of said late and severally communicate with radia lydisposed openings 45, 46 and 47, formed in an annular recess 48 cut intothe upper surface of said plate and affording a seat for a rotatablevalve 49. The valve 49 is constructed with an enlarged bore 50 extendingfrom the upper end thereof to an approximately cent a point and with areduced bore 51 extending to the lower face thereof and communicatingwith the bore 50 concentrically thereof. The bore 50 is recessed atopposite sides as at 52 to receive the laterally projecting extensions53 of a narrow head 54 carried upon the valve stem 55, the latter beingprojected through the head 43 and beyond said head being connected bymeans of a set screw 56 with a horizontal arm 57. The arm 57 is in turnconnected by means of a compensating link 58 with a link 59 and thelatter is in turn connected by means of a compensating link 60 with theupper end of the arm 25. The valve 49 is of reduced diameter in itsupper portion, whereby a space occurs between the same and the undercutportion of the body 42, the said space affording an annular steampassage 61. The head 43 is likewise undercut in its bottom surface toafford a steam passage 62 which communicates with the bore 50 and withan exhaust conductor 69, leading from said head. The valve 49 isconstructed at one side thereof with a groove 63, affording a steampassage and being of sufficient width to be in continuous communicationin either position of said valve with a steam supply pipe 64. The saidvalve is likewise constructed with inlet ports 65 and 66 between thebottom and the outer faces thereof, the ports 65 and 66 being incontinuous communication with the steam passage 61. Between the ports 65and 66 is an exhaust port 67 communicating with the bore 51, and at theother side of the port 65 is a similarly constructed exhaust port 68.

By reference to Fig. 5, it will be noted that the valve 49 is in suchposition that the port 65 registers with the opening 46 and that theports 68 and 67 register with the respective openings 45 and 47. Withthe valve in this position, steam enters the chest from the pipe 64,through the passage 63, circulating mto the passage 61 from whence itpasses by way of the port 65 and opening 46 in their registeringrelation, through the post 37 into the engine cylinder 2 between thepistons 9 and 10 forcing them away from one another, and

the charge previously admitted to the ends of said cylinder is, in thismovement of the pistons, forced through the ports 35 and 36 and therespective openings 45 and 47, through the ports 68 and 67 communicatingwith the openings 45 and 47 into the bore 51, from whence it has egressby Way of the bore 50 and steam passage 62 through the exhaust pipe 69.WVhen the pistons 9 and 10 reach the termination of their outwardmovement, the valve 49 will be shifted by means of the connectionsdescribed to such position that its ort 47 will register with theopening 46 anc that its ports 65 and 66 will register with therespective openings 45 and 47. In this position of the valve the steamadmitted into the steam chest will, pass through the openings 45 and 47into the ends of the cylinder 2, forcing the pistons 9 and 10 towardsone another, and the previous charge of steam will exhaust through theport 37, opening 45, and port 67, into the bore 51, and thence throughthe pipe 69 in the manner above described. It will thus be seen that theorts 65 and 67 serve as respective inlet anc exhaust ports in theirregistering relation with the single opening 46 leading from the centerof the cylinder 2, in addition to the same function in connection withthe respective openings 45 and 47, leading from the ends of saidcylinder, and that the ports 68 and 66,

der, op osed pistons workingthereinasteam chest p ate on said cylinder,and a steam chest on said plate, said plate having three ports, thecentral port communicating with the cylinder centrally thereof and theextreme ports communicating therewith at its ends, of a rocking valve insaid steam chest and constructed to cooperate with the wall of saidchest to afford independent inlet and exhaust steam passages, said valvebeing formed with an enlarged upper bore communicating with the exhauststeam passage,- and with a reduced lower bore, said valve being formedwith four ports, extending from the lower face alternately to the outersurface thereof and to the surface of said lower bore and formed toregister with the ports of said plate, as and for the purpose set forth.

2. The combination with an engine cylinder, opposed pistons therein anda steam chest having three orts, the central port communicating with theengine cylinder centrally thereof, and the extreme ports communicatingwith the respective ends of said cylinder, of a rocking valve in saidsteam chest shaped to co-act with the walls thereof to affordlndependen'tinlet and exhaust assages, said valve being provided withfour alternately arranged inlet and exhaust ports communicating withsaid respective passages the two intermediate ports of said valve beingdesigned for register alternately with the central port of said steamchest and the two extreme ports being designed for registry laternatelywith the adjacent extreme ports of said steam chest as and for thepurpose set forth.

In testimony whereof I have signed my name to the specification in thepresence of two subscribing witnesses.

HILMOR E. LUNDGREN.

Witnesses:

GEO. E. TURKINGTON, FREDK. J. LAP on.

